Roller or like machine part



F. V. HETZEL.

ROLLER 0R LIKE MACHINE PART. PPL'ICATION FILED 1AN.11;1919.

1,372,509; Patented Mar.22,t1921.

UNITED STATES PATENT OFFICE.

g `lEIREDERIC Vf HETZEL, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO LINK-BELTCOMPANY, `OIi CHICAGO, ILLINOIS, A `".3ORIORATION OF ILLINOIS.

` ROLLER 0R LiKE Mannini; PART.

" Specication of Letters Patent. Patgnted 13,13 22, 192L Applicationfiled January 11, `1319. SerialnNe. 270,696.

To all whom it may concern.'

Be it known that I, Fniinnnio V. HETZEL, a citizen of the United States,and a resident of Indianapolis, county ofMarion, State of Indiana, haveinvented certain Improve ments in Rollers or like Machine Parts, oiwhich the following is a specification.

My invention relates to certain improve-- ments in wheels, rollers, andlike machine parts, in which there is a rim having a chilled surface,and a hub, also having a chilled surface.

@ne object of my invention is to design the roller, or other element,`sothat the chill mandrel for the hub can he readily withdrawn, leaving anopening with parallel sides.`

A further object of the invention is to make a roller, or other machineelement,

having a chilled periphery, and a chilled hub, in which the bore can bemade of an even diameter throughout-` In the accompanying drawings:

Figure 1 is a side view of a roller illustrating my invention;

Fig. 2 is a sectional Fig. l; i

Fig. 3 is a perspective view of the hub, showing the cracks madetherein, due to the breakage of the parts;

view on the line 242,

Fig. l is a side view illustrating a hub in which a rectangular openingis formed;

Fig. 5 is a face view of a plate wheel illustrating my invention; and

Fig. 6 is a view illustrating a modification of the invention.

In the present instance, l is a roller `adapted to travel on a track andarranged to sup port conveyer or other chains. This roller has a rim 2and a flange 8. The surface et of the flange, as well as part of therim, is chilled in the ordinary manner. 5 is a 'hub and 6, 6 are spokesextending from the rim to the hub. These spokes may be made in anysuitable manner and are preferably niadeas shown in Fig. i. Each side otthe hub 5 is recessed, in the present instance, as at 7, leaving acomparatively narrow web 8. The internal surface 9 of the hub is chilledand the opening 10, iormed in the hub, is of an even diameterthroughout.

In ordinary practice, if a chill mandrel of an even diameter throughoutbe used, it is impossible to withdraw the mandrel from the hub withoutdestroying it, owingto the shrinkage of the parts onto the mandrel. Insome' instances, the opening may be made by providing the mandrel with aconsiderable taper. This is objectionable, as it is diliicult andexpensive to grind or bore the chilled hub so as to provide an openingof an even diameter to allow the roller to rotate freely on a pin.

I have found that by making the recesses in the hub, as at 7, whichreduce the inner wall at one or more points to a mere shell, that whenthe roller, or other machine element, cools, it will crack the web orwebs S, and this cracking or parting of the hub allows ior thewithdrawal or the mandrel.

`The cracking of the hub does not materially reduce the strength of theroller, nor does it interfere with its travel on the spindle, or pivotpin. The result is that I obtain a true hardened bearing.

By making the roller, as indicated in Fig. l, where the hub is made intwo sections connected together by narrow webs, and by arrangingsubstantial spokes to support each section, the strength oit the rolleris not iinpaired to any appreciable extent andits life is prolonged, dueto the chilled surface at the hub, as well as at the periphery.

'While I have shown a cylindrical opening in the hub, as in Fig. 1, theopening may be of any shape desired. In Fig. 4C, I have illustrated arectangular opening.

In some instances, a single slot may be madeto form one weak spot, ormore than two slots may be made, if desired, depending upon the size andcharacter of the hub.

While I have shown a roller havin@ a chilled rim and a chilled hub, thechilled rim may be dispensed with in some instances, but it is highlydesirable to make this hub in the manner shown where there is a chilledrim, as the rim has a tendency to shrink, and, as its surface is more`e2;- tended than that of the hub, it tends to contract the hub and bindthe chill mandrel therein.. 4

Instead of the spokes, a plate may be used to connect the rim and thehub, as shown in Fig. 5, and the wall may he made with a single or adouble plate, as desired.

InlFig. 6,1 have shown the hub having three perforations 7, which form.the webs 8EL in the hub, and these may be formed by cores in theordinary manner so that when the roller, or other machine element,cools,

the hub-Willbe cracked at these points andl the Chill mandrel can bereadily Withdrawn.

Bythe abovel oonstruotiom it will be seen that I am enabled to make aroller, or other element, havinga rim and hub, in which the periphery ofthe rim is chilled, as Well as the Wall of the pivot pin opening in thehub.

I claim:

l. A roller, or like machine element, having an integral hub'and rim;said hub having alongitudinal opening therein, the Walls of the openingintheahub being` chilled, and the hub beingreduced at one or more pointsto form a-Weak portion, so that as the hub expands during cooling, itmay crack to :1lloW for the Withdrawal of the chill mandrel.

2. A roller, or other machine element, luwing a rim and hub in the formof un integral Casting, the hub having n longitudinal opening therein ofun even diameter throughout, the periphery of the rim :1nd the walls ofthe opening being chilled, und the hub beingr reduced at one or morepoints to form :i weak portion or portions, the hub being' cracked :itthe Weak portions to allow for the removal of the ehill mandrel.

In witness whereof I aiix my Signature.

FREDERIC VI HETZEL.

